We claim the ornamental design for a portion of a quarter of a footwear article, as shown and described.

Description

FIG. 1 is a side elevation view of a portion of a quarter of a footwear article; and,

FIG. 2 is a rear, side perspective view of the portion of the quarter of a footwear article of FIG. 1.

The ornamental design that is claimed is shown in solid lines in the drawings. The broken lines shown in FIG. 1 through 2 are included for the purpose of illustrating environmental elements only and form no part of the claimed design.